Usage:
Eyer Limestone Member of Hatter Formation of Black River Group (PA)
Eyer Member of Hatter Formation of Black River Group (PA)
Geologic age:
Late Ordovician (Mohawkian; Turinian)
Type section, locality, area and/or origin of name:
Type section: both sides of Pennsylvania RR cut north of Union Furnace, Huntingdon Co., PA. Named from Eyer, north of Union Furnace (Kay, 1943, 1944).
AAPG geologic province:
Appalachian basin
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).